Vacuum tube



Dec. 17, 1929. G. H. PERRYMAN VACUUM TUBE FiledFeb. 26, 1929 jvwantoz r 7 3512* @Mgg/14W er Patented Dec. 17, 1929 UNITED srATESijPATi-:NT veasier: v

GEORGE in PEJaRYItIAnf,"'orfTEaNEoiitL NEWl JERSEY, AssIGNoE, "BY yiirEsNE AssI'GN MENTS, TOTERRYMAN ELECTE1C Co.,-1NC., A CORPORATION 0E DELAWARE l VACUUM: TUBE .Application filed February 26,1929.' Serial No.' 342,889.

This invention relates to an improvement in a vacuum tube of the thermionie type particularly adapted to radio purposes, and: has for its object to provide a tube-ot this character in which the various internal elements or parts of the tube structure will be strongly reinforced and braced so that the electrical characteristics ot the tube will not be readily changed by the shifting of the parts of the tube relative to one another by reason ot rough handling, abuse in shipping or in general use. y

A. further object of this invention is to provide a strongly reinforced tube structure of the character described in which the reinforcing or bracing elements will be so arranged and disposed relative to the other parts of the tube that 4these reinforcing or bracing elements will in no manner interfere with the formation of a desirable and satisfactory vacuum in the tube.

I am aware that in tubes of the prior art, an etiort has been made to add rigidity to the tube structure bythe use of braeingmembers, of various kinds. In such instances, the

brace members used were ot such shape and dimension and were so disposed with respect to the tube elements, and particularly with respect to the anode or plate, that they prevented or else impeded the formation of a satisfactory vacuum within the tube.

In most of the tubes of the prior art, the anode or plate member was of tubular form, and when brace members were used, the same being placed across the top and bottom extremities ot' the plate, acted to effectively close the saine. Thus, during the evacuation proegases were trapped within the plate and the formation of a satisfactory vacuum within the tube was prevented. 1

As heretofore stated, the object therefore ot this invention is to provide a vacuum tube structure wherein a rigidly braced arrangement o't the tube parts is provided, the design and disposition of the brace n'ien'ibers with respect to the other parts being such that the evacuation process is in no manner interfered with or impeded.

With these objects, and such other objects as may hereinafter appear in View, I have devised the particular arrangement of parts described below and more particularly pointed out -in the claims appended hereto.

Reference is to be hadl to the accompanying drawings, forming a part hereof, in which Figure 1 is a front elevation of the tube structure, with the glass enclosing envelope omitted for clarity in illustration;

Figure 2'is a perspective view of one of the brace members; and f v Figure 3 is a view of the tube on the line 3-3 of Figure 1, .looking in the direction of the arrows. A V

Throughout the Various views of the drawing` similar reference characters designate similar parts.` 1

Inthe embodiment .of my invention disclosed in the accompanying drawing, 1 indicates the conventional glass tube stem, the upper end voi which terminates in the usual press 2. Sealed within the press 2 and projecting upward therefrom are the iilament leads 3 and 4 which connect-to the opposite ends of ythe filament 5. said filament extending upwardly and passing over hooked ends 6 formed'on a pair ot inverse springs 7 and thence 'extending downwardly to an anchorage member 19. The springs 7 are supported on the upper face of a brace member 8 which is preferably made ot any suit-able kind of insulation. v

Extending .upwardly from the press 2, wherein its lower end is sealed, is a grid lead 9, which is welded, fused, or otherwise affixed to the lower end of one of the grid-supporting wiies 10. A similar grid-supporting wire is shown atv lland the same (ro-operates with the wire 10 to effectively support the conventional type of wire grid 12.v 'It will,-of course, be -understood that when a reetifying tube is made in accordance with myl invention herein described, the grid may be omitted.

At- 13 and 14 are the plate-supporting wires. The same are secured at their lower ends to a metallic band or strap 15 which is securely held around the tube stem substantially as shown in the drawing. and thewire14 is connected to a lead-in wire 20. These wires 13 and Mexten'd upwardly to support the anode or plate'member 16.

This ,plate member lor anode 16 vmay be made of any suitable material such assheet 5 metal. I prefer, however, in carrying-out myinvention to use a; finely-woven met'alllc mesh land have, in the accompanying drawing, shown .thefplate member 16 .as beingV made"'of"s'ml1`'ma'terial.`- It willbe' under?"v stood, however; that l do not'limit-'my invention-to the use ofsuch'material.

At 8 and17 are shown the tube brace members. 4The same consist in a pair of flatnar rowstrips of insulation of sufficient body and l thickness'to securelyfhold the various parts of the'tube' structure in their proper relationship. These strips, one ofjwhich is disclosed in perspective in Figure-2 are fiat, narrowelongatedrmembers and -'areeaclrprovided with a plurality of holes-or apertures 18 to permit the various wires.to-.passthrouglr4 f thenn-v Forfinstance the lower brace-member l Y 17 is perforated to permit thepassageeof the Vwires l0, 11,513 'and'14 as well as the filament" 2'5 a'r'ichorage'wire19,'whilst-Lthel top. brace-mem-` f v berf8isfsuitably perforated' to .permit the pass. sag'ehthroughjl-itjof thefwires 311,12, 13,514 and thefho'oked spring terminals 6. 'l

It is to be noted that the plate memberl isf' `ment supporting andgridsupporting wires,

a pair of spaced narrow insulating strips per tubular-platefofgreatertransverseiwidth than tllewidtlr'of sa'idstrips, said strips b 'eing lo- Y cated. at and-abutting :against-the upper and lower endsl of the'plate and so disposed as to z retain a considerable portion of the upper and plate 1n an uncovered or v `Statey New lower ends of said' open condition. 'y 4 Signed at the-citycountyfand York, this4 25th day vof'liebruary, 1929'.

firmly held between the brace 4members 18 and X.

17, the opposite ends thereof abuttingagainstthese 'members The various wirespassing through the spaced openings are eiectively spaced l"from one another and' are .constantly maintained in such-definite spaced relationship. Furthermore it will also be noted that these brace members are of substantially narrow width so that while the same rest securely against` the upper and lower ends of the vpla-te 4o member 16 they doA not close the openiends of the same (see Figure 3) The plate member being of greater transverse or cross sectional width than the width` of these end braces, therefore has a large portion of its upper and lower open ends uncovered with the result that these braces do not act, as has been the case in prior structures, to trap gases within the plate structure, as such gases may freely pass out lthrough the open upper and lower y ends of the'plate.

Furthermore, 'through the arrangement" just disclosed, 'I find it unnecessary-to cut awayor perforate'the'plate as has in'some types of prior tubes been done to aid in evacuating'the'tube.

Having described one embodiment; of my invention, it isobvioushat the same is not to be restricted'thereto, but'is broad enough to Coverall structures lcoming within the scope l '60 of the 'annexed-claims.

WhatI claim-isz- 1. Ina-vacuum tube,`=a filament and a tubularanOde, -bra'cefmembers extending across theupperv and lower ends of said anode and l fabuttingfl against the same, said brace mem- Aforated to: permitzlthe passage of said wires, a,

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